Abstract:

The parallel time interleaved sampling system can avoid the conflict between sampling rate and quantization precision of a single chip analog to digital converter (ADC). However, the multi-channel mismatch may degrade the performance of the system greatly. A novel multi-channel sampling system mismatch estimation method based on subspace projection technique is presented. The method, which carries out timing and gain mismatch estimation simultaneously by exploiting the properties of the phase differences caused by the time interleaved array in frequency domain, is robust to residual offset error and noise. The effectiveness of the proposed approach is verified by simulated data.